We have separated the norm \(|X_{ll^{\prime }}|\)  and the phase \(\Phi _{ll^{\prime }}\)  of the angle coupling.
These angle couplings can be grouped to form the link couplings \(Y_l\) 's [1]} such that
\(\prod _{n\in \Gamma }\, \prod _{l,l^{\prime },l^{\prime \prime } \in v} X_{ll^{\prime }}^{J_n-2j_{l^{\prime \prime }}}=\prod _{l\in \Gamma }Y_{l}^{2j_l}\,.\) 
<FIGURE>